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Quantum dots fromed in 3D Dirac semimetal Cd3As2 nanowires with magnetic barriers

Title
Quantum dots fromed in 3D Dirac semimetal Cd3As2 nanowires with magnetic barriers
Authors
Jung, MinkyungYoshda, KenjiPark, KdongZhang, Xiao-XiaoYesilyurt, CanSiu, Zhou BinJalil, MansoorPark, Jin WanPark, JeungheeNagaosa, Naoto서정필Kazuhiko
DGIST Authors
Jung, Minkyung서정필
Issue Date
2018-08-01
Citation
34th International conference on the physics of semiconductors (ICPS 2018)
Type
Conference
Abstract
Three-dimensional (3D) Dirac semimetals have attracted considerable attention owing to their exotic properties, both predicted in theory and recently demonstrated experimentally. Here, we demonstrate single quantum dots confined with two p-n junctions in 3D Dirac semimetal Cd3As2 nanowires under high magnetic fields. The device can be operated in two different regimes: (i) an n-typechannel between n-type leads underneath the source-drain contacts, creating an open regime (n-n-n configuration); (ii) a p-type channel in the middle of the nanowire, forming a p-type quantum dot (QD) (n-p-n configuration). At zero magnetic field, the quantum confinement effect vanishes in the n-p-n QD because the Dirac fermions penetrate p-n junctions with high transmission probability (Klein tunneling). However, the high magnetic fields bend the Dirac fermion trajectories at the p-n junction due to cyclotron motion, preventing the Klein tunneling. This results in a strong confinement at p-n junctions of Dirac materials. In this regime, the device shows clean Coulomb diamonds, indicating that a single QD is formed in a Dirac semimetal nanowire.
URI
http://hdl.handle.net/20.500.11750/14836
Publisher
University of Montpellier
Related Researcher
  • Author Jung, Minkyung Quantum Nanoelectronic Devices Lab
  • Research Interests nanoelectronics, quantum transport, quantum physics, qubit, condensed matter physics,
Files:
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Collection:
Division of NanotechnologyQuantum Nanoelectronic Devices Lab2. Conference Papers
Division of Nanotechnology2. Conference Papers
Department of Physics and ChemistryNanospm Lab(Advanced Materials Research Group)2. Conference Papers


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